// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_MIDI_MIDI_MANAGER_MAC_H_
#define MEDIA_MIDI_MIDI_MANAGER_MAC_H_

#include <CoreMIDI/MIDIServices.h>
#include <stdint.h>
#include <map>
#include <string>
#include <vector>

#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/threading/thread.h"
#include "media/midi/midi_export.h"
#include "media/midi/midi_manager.h"
#include "media/midi/midi_port_info.h"

namespace midi {

class MIDI_EXPORT MidiManagerMac final : public MidiManager {
public:
    MidiManagerMac();
    ~MidiManagerMac() override;

    // MidiManager implementation.
    void StartInitialization() override;
    void Finalize() override;
    void DispatchSendMidiData(MidiManagerClient* client,
        uint32_t port_index,
        const std::vector<uint8_t>& data,
        double timestamp) override;

private:
    // Runs a closure on |client_thread_|. It starts the thread if it isn't
    // running and the destructor isn't called.
    // Caller can bind base::Unretained(this) to |closure| since we join
    // |client_thread_| in the destructor.
    void RunOnClientThread(const base::Closure& closure);

    // Initializes CoreMIDI on |client_thread_| asynchronously. Called from
    // StartInitialization().
    void InitializeCoreMIDI();

    // CoreMIDI callback for MIDI notification.
    // Receives MIDI related event notifications from CoreMIDI.
    static void ReceiveMidiNotifyDispatch(const MIDINotification* message,
        void* refcon);
    void ReceiveMidiNotify(const MIDINotification* message);

    // CoreMIDI callback for MIDI data.
    // Each callback can contain multiple packets, each of which can contain
    // multiple MIDI messages.
    static void ReadMidiDispatch(const MIDIPacketList* packet_list,
        void* read_proc_refcon,
        void* src_conn_refcon);
    virtual void ReadMidi(MIDIEndpointRef source, const MIDIPacketList* pktlist);

    // An internal callback that runs on MidiSendThread.
    void SendMidiData(MidiManagerClient* client,
        uint32_t port_index,
        const std::vector<uint8_t>& data,
        double timestamp);

    // CoreMIDI
    MIDIClientRef midi_client_;
    MIDIPortRef coremidi_input_;
    MIDIPortRef coremidi_output_;
    std::vector<uint8_t> midi_buffer_;

    // Keeps track of the index (0-based) for each of our sources.
    typedef std::map<MIDIEndpointRef, uint32_t> SourceMap;
    SourceMap source_map_;

    // Keeps track of all destinations.
    typedef std::vector<MIDIEndpointRef> DestinationVector;
    DestinationVector destinations_;

    // |client_thread_| is used to handle platform dependent operations.
    base::Thread client_thread_;

    // Sets true on destructing object to avoid starting |client_thread_| again.
    bool shutdown_;

    DISALLOW_COPY_AND_ASSIGN(MidiManagerMac);
};

} // namespace midi

#endif // MEDIA_MIDI_MIDI_MANAGER_MAC_H_
